package demo3;

import java.util.HashMap;
import java.util.Map;
@SuppressWarnings({"all"})
public class test {
    public static void main(String[] args) {
        Map map = new HashMap();
        map.put("no1","hsp");
        map.put("no2","zzy");
        System.out.println(map);
        //map.remove("no1");
        System.out.println(map);
        //iscontainkey判断是不是包含这个键
        //clean清除键值对
        //size获取元素的个数
    }
}
